Cascarudo

The cascarudo lives in almost every South American basin, from Trinidad to Buenos Aires, from still, oxygen-free water to flowing streams. It gulps air and, when the water dries up, can leave it and crawl to another pool. Nocturnal, it eats insects, fish and plants. When breeding the male becomes more colourful, with a thicker pectoral spine, and builds a bubble nest among floating plants, which he guards fiercely. It reaches about 20 centimetres.

Scientific name

Callichthys callichthys

Family

Callichthyidae